multiple columns update

Is there a way to get around this problem? I am trying to update multiple columns in the same 'update' statement without using a subquery.
update /table_name/
set (column_name, column_name)=(value, value);
ERROR at line 2:
ORA-01767: UPDATE ... SET expression must be a subquery

Try this way,
update test set c2=2,c3=3 where c1=1;

thanks
anand